Networked sound masking system with centralized sound masking generation

Abstract

A sound masking system for shaping the ambient noise level in a physical environment. The sound masking system comprises a networked and distributed system having a number of master units coupled together and to a control unit. One or more of the master units may include satellite sound masking units which function to reproduce an audio signal generated by a central sound masking module. The audio signal comprises a sound masking signal, a paging signal or a sound masking signal mixed with a paging signal. The sound masking signal is generated by the central sound masking module or a selected from a number of sound masking signal inputs at the control unit. Each of the master units is addressable over the network by the control unit enabling the control unit to control the contour, spectral band, and gain characteristics of the audio output signal. The system may also include a remote control unit which provides the capability to tune and adjust each master sound masking unit in situ without requiring physical access through the ceiling installation.

Description

FIELD OF THE INVENTION[0001]The present invention relates to sound masking, and more particularly to a networked system with centralized sound masking generation.BACKGROUND OF THE INVENTION[0002]Sound masking systems are widely used in offices and similar workplaces where an insufficient level of background sound results in diminished speech privacy. Such environments suffer from a high level of noise distractions, and lower comfort levels from an acoustic perspective. Sound masking systems operate on the principle of masking which involves generating a background sound in a given area. The background sound has the effect of limiting the ability to hear two sounds of similar sound pressure level and frequency simultaneously. By generating and distributing the background noise in the given area, the sound masking system masks or covers the propagation of other sounds in the area and thereby increases speech privacy, reduces the intrusion of unwanted noise, and improves the general ac...

AI Technical Summary

Problems solved by technology

Sound masking systems are widely used in offices and similar workplaces where an insufficient level of background sound results in diminished speech privacy.

Such environments suffer from a high level of noise distractions, and lower comfort levels from an acoustic perspective.

The background sound has the effect of limiting the ability to hear two sounds of similar sound pressure level and frequency simultaneously.

Centralized systems are characterized by achieving uniformity of output, but not uniformity of acoustic response for the space.

In practice, it is difficult to accommodate environmental acoustic variations using a centralized system because the volume and frequency spectrum adjustments required for the typical physical zone size are too large to achieve a uniform acoustic result.

A further disadvantage is that many of the adjustments for a centralized sound masking system require an installer or technician to re-enter the ceiling space or to rewire the speakers in the system.

However, with existing systems it is still necessary to re-enter the ceiling to adjust the frequency spectrum and volume output level for each master sound masking unit, and the controls for providing multi-unit volume zone adjustments require the hardwiring of the units.

While existing independent self-contained systems are more flexible than centralized systems in many regards, they do not satisfy all the requirements of an ideal sound masking system as discussed above.

Second, any centrally located controls only affect the output level for the speakers or sound masking units which have a hardwired connection.

It will be appreciated that this severely limits the adjustability of the system to future changes unless at least some of the system is rewired.

Third, adjustments to existing systems must be made on-site.

Images